Use compose-go + improvements (#9)

Use compose-go https://github.com/compose-spec/compose-go  to make Katenary parsing compose file the official way.
Add labels:
- `volume-from` (with `same-pod`) to avoid volume repetition
- `ignore` to ignore a service
- `mapenv` (replaces the `env-to-service`) to map environment to helm variable (as a template string)
- `secret-vars` declares variables as secret values

More:
- Now, environment (as secret vars) are set in values.yaml
- Ingress has got annotations in values.yaml
- Probes (liveness probe) are improved
- fixed code to optimize
- many others fixes about path, bad volume check, refactorisation, tests...

helm/k8sbase.go

@@ -0,0 +1,73 @@
+package helm
+
+import (
+	"crypto/sha1"
+	"fmt"
+	"io/ioutil"
+	"strings"
+)
+
+// Metadata is the metadata for a kubernetes object.
+type Metadata struct {
+	Name        string            `yaml:"name,omitempty"`
+	Labels      map[string]string `yaml:"labels"`
+	Annotations map[string]string `yaml:"annotations,omitempty"`
+}
+
+func NewMetadata() *Metadata {
+	return &Metadata{
+		Name:        "",
+		Labels:      make(map[string]string),
+		Annotations: make(map[string]string),
+	}
+}
+
+// K8sBase is the base for all kubernetes objects.
+type K8sBase struct {
+	ApiVersion string    `yaml:"apiVersion"`
+	Kind       string    `yaml:"kind"`
+	Metadata   *Metadata `yaml:"metadata"`
+}
+
+// NewBase is a factory for creating a new base object with metadata, labels and annotations set to the default.
+func NewBase() *K8sBase {
+	b := &K8sBase{
+		Metadata: NewMetadata(),
+	}
+	// add some information of the build
+	b.Metadata.Labels[K+"/project"] = "{{ .Chart.Name }}"
+	b.Metadata.Labels[K+"/release"] = ReleaseNameTpl
+	b.Metadata.Annotations[K+"/version"] = Version
+	return b
+}
+
+func (k *K8sBase) BuildSHA(filename string) {
+	c, _ := ioutil.ReadFile(filename)
+	//sum := sha256.Sum256(c)
+	sum := sha1.Sum(c)
+	k.Metadata.Annotations[K+"/docker-compose-sha1"] = fmt.Sprintf("%x", string(sum[:]))
+}
+
+// Get returns the Kind.
+func (k *K8sBase) Get() string {
+	return k.Kind
+}
+
+// Name returns the name of the object from Metadata.
+func (k *K8sBase) Name() string {
+	return k.Metadata.Name
+}
+
+func (k *K8sBase) GetType() string {
+	if n, ok := k.Metadata.Labels[K+"/type"]; ok {
+		return n
+	}
+	return strings.ToLower(k.Kind)
+}
+
+func (k *K8sBase) GetPathRessource() string {
+	if p, ok := k.Metadata.Labels[K+"/path"]; ok {
+		return p
+	}
+	return ""
+}